ATTINY817-MFR. datasheet(154/492 Pages) MICROCHIP

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20.3.4

Events

The peripheral can take the following actions on an input Event:

•

The counter counts positive edges of the Event signal.

•

The counter counts both positive and negative edges of the Event signal.

•

The counter counts prescaled clock cycles as long as the Event signal is high.

•

The counter counts prescaled clock cycles. Event signal controls the direction of counting. Up-

count when Event signal is low, down-count when Event signal is high.

The specific action is selected by writing to the Event Action bits (EVACT) in the Event Control register

(TCA.EVCTRL). Events as input are enabled by writing a '1' to the Enable Count on Event Input bit

(CNTEI in TCA.EVCTRL).

Event controlled operation is not available in Split Mode.

20.3.5

Interrupts

Table 20-3. Available Interrupt Vectors and Sources in Normal Mode

Offset Name Vector Description

Conditions

0x00

OVF

Overflow and Compare match

interrupt

The counter has reached its top value and wrapped to

zero.

0x04

CMP0 Compare channel 0 interrupt

Match between the counter value and the Compare 0

0x06

CMP1 Compare channel 1 interrupt

Match between the counter value and the Compare 1

0x08

CMP2 Compare channel 2 interrupt

Match between the counter value and the Compare 2

Table 20-4. Available Interrupt Vectors and Sources in Split Mode

Offset Name

Vector Description

Conditions

0x00

LUNF

Low-byte Underflow interrupt Low-byte timer reaches BOTTOM.

0x02

HUNF

High-byte Underflow interrupt High-byte timer reaches BOTTOM.

0x04

LCMP0 Compare channel 0 interrupt Match between the counter value and the low-byte of

Compare 0 register.

0x06

LCMP1 Compare channel 1 interrupt Match between the counter value and the low-byte of

Compare 1 register.

0x08

LCMP2 Compare channel 2 interrupt Match between the counter value and the low-byte of

the Compare 2 register.

When an interrupt condition occurs, the corresponding Interrupt Flag is set in the Interrupt Flags register

of the peripheral (peripheral.INTFLAGS).

An interrupt source is enabled or disabled by writing to the corresponding enable bit in the peripheral's

Interrupt Control register (peripheral.INTCTRL).

An interrupt request is generated when the corresponding interrupt source is enabled and the Interrupt

Flag is set. The interrupt request remains active until the Interrupt Flag is cleared. See the peripheral's

INTFLAGS register for details on how to clear Interrupt Flags.

ATtiny417/817

Datasheet Complete

DS40001901B-page 154

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